Anthropogenic and Hydroclimatic Controls on the CO2 and CH4 Dynamics in Subtropical Monsoon Rivers DOI Creative Commons

Shuai Chen,

Lishan Ran, Clément Duvert

et al.

Water Resources Research, Journal Year: 2024, Volume and Issue: 61(1)

Published: Dec. 27, 2024

Abstract Anthropogenic perturbations have substantially altered riverine carbon cycling worldwide, exerting influences on dissolved dioxide (CO 2 ) and methane (CH 4 dynamics at multiple levels. However, the magnitude role of anthropogenic activities in modulating emissions across entire river networks, as well influence climatic controls, remain largely unresolved. Here, we explore controlling factors CO CH 62 subtropical, monsoon‐influenced streams rivers through basin‐wide seasonal measurements. We found that land use aquatic metabolism played significant roles regulating spatial temporal patterns both gases. Increased nutrient levels organic matter contributed to higher partial pressure ( p ). Dissolved oxygen, stable isotope inorganic carbon, proportion impervious surface, catchment slope, width were major predictors for . For , Chlorophyll a water temperature, which availability methanogenesis. Seasonal variations strongly modulated by hydroclimatic conditions, with temperature markedly ecosystem metabolism. These findings highlight likelihood changes climate evolve, thereby profoundly affecting global cycle.

Language: Английский

Urbanization Drives Carbon Dioxide Supersaturation in South Asian River Networks: Insights from the Krishna River Basin, India DOI
Rashmi Singh,

Latika Patel,

Shoji D. Thottathil

et al.

ACS ES&T Water, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 6, 2025

Rivers are globally significant sources of atmospheric carbon dioxide (CO2). However, the processes governing supersaturation CO2 in large tropical fluvial networks poorly understood. In particular, strikingly little is known about role land use shaping variability South Asian river basins, which undergoing rapid urbanization. Here, we show that wide partial pressure (pCO2: 246.3–21271.2 μatm) an agriculture-dominated basin (Krishna River basin, India) primarily shaped by extent Specifically, a strong positive correlation between pCO2 and built-up area (%) was observed when exceeded 2%. Furthermore, machine learning analysis showed predicted (%), Strahler order, altitude, together explaining ∼77% spatial variability. Additionally, negative excess oxygen relative to equilibrium indicates in-stream metabolism, fueled organic matter inputs from urbanized areas, primary cause supersaturation, establishing mechanistic link area. Given increases with urbanization, limiting urban crucial for reducing emissions basins.

Language: Английский

Citations

0
Diverse Altitudinal Patterns and Drivers of Greenhouse Gas Dynamics in Southwest China Alpine Streams and Rivers DOI Creative Commons

Ying Wang,

Yuhao Li, Genxu Wang

et al.

Journal of Geophysical Research Biogeosciences, Journal Year: 2025, Volume and Issue: 130(2)

Published: Feb. 1, 2025

Abstract Streams and rivers are globally significant sources of greenhouse gases (GHGs) to the atmosphere. However, GHG evasion from mountain streams remains poorly constrained due scarce data. In this study, we measured concentrations estimated fluxes riverine carbon dioxide (CO 2 ), methane (CH 4 nitrous oxide (N O) across three alpine catchments in Southwest China. these turbulent slightly oversaturated but much lower than global average, likely high gas transfer velocities that rapidly deplete GHGs. Headwater (first‐order) exhibited higher rates large (fourth‐order), despite having CO N O concentrations. The partial pressure dissolved decreased linearly with elevation, linked altitudinal patterns forest cover groundwater table depth. Dissolved CH GHGs showed weak relationships elevation. We observed seasonal differences fluxes, during wet season. spatial heterogeneity stream was primarily controlled by hydrology, climate, geomorphology. Our analyses also revealed were positively correlated water temperature, velocity, channel slope. This study demonstrates underestimated net GHGs, particularly O, highlighting importance headwater systems regional budgets. diverse dynamics suggest complex controls rivers.

Language: Английский

Citations

0
CH4 and CO2 emissions and dissolved carbon exporting in rivers on the upper Lanzhou section of the Yellow River, China DOI Creative Commons

Zhiheng Du,

Hao Cui, Fangping Yan

et al.

Geoscience Frontiers, Journal Year: 2025, Volume and Issue: unknown, P. 102057 - 102057

Published: April 1, 2025

Language: Английский

Citations

0
The spatial–temporal variability of methane emissions in a montane headstream: implication of precipitation, morphology and microhabitat DOI
Honglin Chen, Xiaofeng Wang, Jilong Wang

et al.

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 133534 - 133534

Published: May 1, 2025

Language: Английский

Citations

0
Anthropogenic Perturbations Complicated the Downstream Greenhouse Gas Dynamics of a Large Subtropical Reservoir DOI
Xiang Wan,

Shuai Chen,

Wanfa Wang

et al.

Journal of Geophysical Research Biogeosciences, Journal Year: 2024, Volume and Issue: 129(12)

Published: Dec. 1, 2024

Abstract River damming can significantly alter the hydrology and nutrient levels of river water, resulting in substantial greenhouse gas (GHG) emissions to atmosphere. However, dynamics gases discharged water downstream dams remain poorly understood, despite being recognized as a crucial source GHG river‐reservoir systems. In this study, we conducted comprehensive measurements concentrations chemistry large subtropical reservoir its upstream rivers investigate spatiotemporal patterns fluxes identify their governing mechanisms, with primary focus on dynamics. Our analysis revealed that distribution p CO 2 among was predominantly controlled by aquatic metabolism atmospheric exchange. Conversely, CH 4 N O largely influenced anaerobic metabolism. Seasonal fluctuations were linked hydroclimatic conditions, including temperature, hydrologic connectivity between land rivers, thermal stratification. Anthropogenic activities (e.g., agricultural use) found affect trend concentrations. Higher compared attributed production increased transfer velocity rivers. These findings underscore critical influence anthropogenic emphasize necessity integrating impacts seasonal variability enhance our understanding carbon budget

Language: Английский

Citations

0
Anthropogenic and Hydroclimatic Controls on the CO2 and CH4 Dynamics in Subtropical Monsoon Rivers DOI Creative Commons

Shuai Chen,

Lishan Ran, Clément Duvert

et al.

Water Resources Research, Journal Year: 2024, Volume and Issue: 61(1)

Published: Dec. 27, 2024

Abstract Anthropogenic perturbations have substantially altered riverine carbon cycling worldwide, exerting influences on dissolved dioxide (CO 2 ) and methane (CH 4 dynamics at multiple levels. However, the magnitude role of anthropogenic activities in modulating emissions across entire river networks, as well influence climatic controls, remain largely unresolved. Here, we explore controlling factors CO CH 62 subtropical, monsoon‐influenced streams rivers through basin‐wide seasonal measurements. We found that land use aquatic metabolism played significant roles regulating spatial temporal patterns both gases. Increased nutrient levels organic matter contributed to higher partial pressure ( p ). Dissolved oxygen, stable isotope inorganic carbon, proportion impervious surface, catchment slope, width were major predictors for . For , Chlorophyll a water temperature, which availability methanogenesis. Seasonal variations strongly modulated by hydroclimatic conditions, with temperature markedly ecosystem metabolism. These findings highlight likelihood changes climate evolve, thereby profoundly affecting global cycle.

Language: Английский

Citations

0